PC2100 is 2.1GB/s divided by 64bit(8 bytes) to net a bandwidth of 266 Mhz PC2700 is 2.7GB/s divided by 64bit(8 bytes) to net a bandwidth of 333 Mhz Old rambus in comparison can deliver 3.2 GB/s and 400 Mhz with the right chipset. Just keep in mind raising the speed limit doesn't make your car go faster. The car still has to be able to perform. In addition your memory controller hub(chipset) must be able to support the ram you intend to use, 200, 266, or 333 Mhz DDR to get the benefit of a higher bandwidth. -yui shin Jim wrote: (condensed) I'm comparing type PC2100 to type PC2700. I have not seen any information on what the difference is between the two. --------------------------------- Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml